But I'm guessing the left one is a speed engine. The spinner, and rear exhaust with tuned pipe manifold, say speed speed speed.

And guess #2 the right one is a racing engine. But it looks like it started out life as a front induction motor, and was "turned around", and a new front front housing fitted on the back. So the back is now the front.... And the front is now the back.... I hope you know what I meen,...

But I'm guessing the left one is a speed engine. The spinner, and rear exhaust with tuned pipe manifold, say speed speed speed.

And guess #2 the right one is a racing engine. But it looks like it started out life as a front induction motor, and was "turned around", and a new front front housing fitted on the back. So the back is now the front.... And the front is now the back.... I hope you know what I meen,...

At first glance, you could be forgiven for thinking that this is a sparkie. It is actually a glow engine - a 1948 H & H 45 actually. Only about 120 of these were ever built by Ken Howie Sr. and Charles Heuer of Norristown, PA. What makes this thing special is, the glow element is actually built into the head, which explains why (instead of a plug) it has a short, threaded post on top for attaching a battery lead to.